Leyline of Transformation + Phyrexian Altar + Xathrid Necromancer

UB identity

Commander legal

The 3 combo pieces

• Leyline of Transformation
• Phyrexian Altar
• Xathrid Necromancer

How to execute it

1. Activate Phyrexian Altar by sacrificing any other creature.
2. When the creature dies as a Human due to Leyline of Transformation, Xathrid Necromancer triggers, creating a 2/2 Zombie creature token.
3. Repeat.

What the combo produces

• Infinite colored mana
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers